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qryptfpga
Visitor
Visitor
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Registered: ‎03-15-2021

PCIE PMA loopback

Hi,

Is it possible to perform PMA level loop back through PCIe endpoints pipe interface? 7 Series integrated pcie IP block provides an option to control transceivers through "Additional control and status port". One of the control port is "pipe_loopback[2:0]". Can I set this port to "010" to achieve PMA level loopback in the transceiver? 

Transceiver user guide says the following for Near-End PMA loopback:

• Near-End PMA Loopback (path 2 in Figure 2-26) A GTRXRESET is required after entering and exiting near-end PMA loopback.

How do I assert GTRXRESET to the transceivers from PCIe wrapper. There is no such port that PCIe brings out. 

-Karthick

 

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pvenugo
Moderator
Moderator
140 Views
Registered: ‎07-31-2012

@qryptfpga ,

PIPE loopback of 1 bit will loop it around PCS+PMA i.e. tx -rx loopback. The gtrxreset you need to control from pipe wrapper.

Regards

Praveen


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